I have written Universe Jumping Discord on fimfiction, but I'm not that good at writing so someone else or group of people can write their own version of it if they want.

Basically Discord breaks free again with a new plan to steal a special book from Canterlot's Library in order to learn the secret of multiverse traveling, which he will use to rain chaos in worlds from other universes from MLP FIM to non MLP related universes. The Mane Six with the Elements Of Harmony using magic to track Discord's movements in the multiverse chase Discord from universe to universe to try catch fleeing Discord (who doesn't want to become stone again) with the help of some new friends they make along the way to stop him from causing chaos all across the multiverse.